Fuel pump



Get. 27, 1942.

B. R. POOL 2,300,314

FUEL PUMP Filed Jan. 15. 1940 2 Sheets-Sheet l a v v HQ. 1.

B. R. POOL Oct. 27, 1942.

FUEL PUMP Filed Jan. 15, 1940 2 Sheets-Sheet 2 Patented Oct. 27, 1942wan NrfI-o'FFIcE "Q Byron-R. Piitininisburg; 111., ass ignor one Ih'a'lf to Theodore Cpleman, Mount Carmel, Ill

Application anuary 15, 1940, Serial-No. 313,961 i This inventionrelate'sto fuelpumps for internal combustion nginesyand more particular'Pumps n ines of the solid fuel lnjetion type .1 Y, J:

Such pumps; usually include a h'o'using" con- :taining a series 'ofindividual fuel pumps connected to separate cylinders of'the engine. Thefuel is placed underpressure' in the separate pumps, and fed to theco'i'respondingcylinders through valves designed to open at apredetermined pressure, the amountof fuelfed from each pump beinggoverned by a by-pass' which insures against the passage of fuel to theengine cylinder solong as it isopen." "This type of pump is disclosed inmy application Serial No. 221,405, 1

filed inthe United States' Patent Ofice on July -26, 1938, towhichreference is made for its gen"- eral method of operation. In suchtypes of pumps, "a number of operatingproblemshave arisen. 'Forinstance,there have been instances of the failure of the'by-pass valve because ofabrupt contraction or expansion of thevalveelements when subjectedtosudden fuel temperature changes. Insome cases the changes in dimensionhave been to a degree sufficient to cause seizing and binding ofthemoving elements with consequent damage, or to cause-undueleakage andimproper operation of theengin'ep e' Trouble has also been encounteredin maintaining sufficiently tight seals under the relatively highpressures characteristic of such solid fuel injection engines,"particularly when necessary to adjust theindividual pumps to insure eachdelivering the proper amount of fuel to its cylinder relative to theother pumps. f

In overcoming'the aforesaid disadvantages, it is a major object of thisinvention to provide an improved fuel'pump characterized by lor'igerandmore dependable 'iservice, -and less tendency to v 711- 1-.

A further object of this invention is to provide a fuel pump havinga-novel by-pass valve construction'vvherein continued proper performanceof .--the pump is insured reg rdless of changes-in fueL-temperaturei' I:Still a further object-- of this invention is the provision of novelsealing means for a. pump'of the type described, wherein moresatisfactory sealing over longer periods of time is insured, and theindividual pumpassemblie's can be more easily adjusted to adjust therelative; deliveries of fuel'to their respective cylinders. 1 i

Furtherobiects 'and advantages of the present invention will appear fromthe following description'andIattacheddrawings, wherein.

.- Figure. 1 is a side elevation, taken-partly in section; ofafuel pumpembodying thepresent' invention; the pump shown beinggovernor-controlled,"=- r w a or housing is shown at" 'I I.

' plate "secured to shaft l3.

' Figj-Z is a vlew'simil'ar to the upper end of Figure lillustratinganembodiment of the inve'ntion'in a manually controlled pump.

Fig.3 is'an exploded view, taken partly in section,"of the b'y passvalveassembly of Figure 1. 1

Figs. 4 to'7,f inclusive, are side elevations of a by-pass valve of;"the present invention, the different Views n'gftaken around the valveat intervals','- 1 1 I I Figs; 4a and 5a are end elevations of the valveas viewed in Figs. 4 and 5, respectively,

Fig."8 is an explodedwiewin section of a'v'alve cageof thepresentinvention with 'the gasket provided therefor.

Fig. 9 is -a'plan of thevalve cage of Fig. 8; 9 Figs. 10 and 11"arepl'ans of the sums preferably used to adjust the individual pumpassem'- blies in the housingcylinders. 1

"Fig; 1-2-is 'anexploded view of the spring pressed valve controllingthe feed flow" to" the cylinders.

Figl'lB is a section of the assembled'valve of Fig 12..i With referenceto Figure-1, a fuel pum ta' e -A shaft l2 arranged to be-drivenfrorn theengine is mounted'=in*'the housing, and is connected, by means not"shown, to drive a vertical shaft l3 in synchronism w'ith the engine. Acentrifugal governor (not shown in detail), the weights ofwhich-are-shovvn atld, is provided to control the'disch'arge of fuelfrom the pump, a lever l5 being provided to adjustthe governor.-Atappetenc1osing ring I6 is provided above housing ll within-whichrevolves a cam The-features thus far described'have been described onlyso far as they are'necessary to an understanding of the*presentinvention. Refer ence -ismade to my 'co'pending application aboveidentified 'foi; ti-description bf the detailed structure of the'pumpmechanism contained within the'housing andits manner of operation.

A fuel pump head,- generally indicated at H. and preferablyof one-piececonstruction, is provided atop ring I B and is secured thereto by suitable fastening means. Head H includes a section ll formed withaccurately dimensioned 'andpreferably polished bores l8 to'rece'ive fuelpump assemblies l9'for the several cylinders of the engine on' which thepump is mounted. Eachof the fuel pump assemblies includes acylinder 2|fitted 'in a bore 18 and secured therein by suit able fastening means,as'des'cribed in mycopending application ab'oveldenti1'ied. The relativeposition of thecylinders in bores I8 is prefer-- ably determined bytheuse of shims inserted be- V Each cylinder 2| has a' central bore toreceive a piston orplung'er- 22 normally urged down suitable connectionI05. as shown in Figure 2.

A passage 3i for each pump unit 19 is provided leading from chamber 29to an aperture 32 in the cylinder wall to deliver fuel to the cylinderbore when plunger 22 is withdrawn. Passage 3i is preferably formed bydrilling from the outside of head H, the passage thus formed outside thecylinder being sealed by a plug 3|. Aperture 32 is preferably formed.both as a round aperture and as a slot to facilitate the entrance offuel into the cylinder bore, as described in my copending applicationabove identified.

The inner wall of recess 24 in housing If is provided with a series ofpassages 33 corresponding in number to passages 3i, each leading to anaperture 34 in the side of each piston. Passages 33 are preferablydrilled in a manner-similar to passages 3|, the outer ends of thepassages being sealed by plugs 33'. Whenpassage 33 is closed by means tobe later described, and the fuel is placed under pressure in a cylinderi3 by the plunger therein, it will pass to the selected engine cylinderthrough a connection generally indicated at 35, which preferablyincludes spring-pressed valve assembly, shown in detail in Figs. 12 and13, to prevent the passage of the fuel except at a predeterminedpressure. When passage 33 is open, the fuel placed under pressure in thecylinder i3 will by-pass therethrough and will not go to the enginecylinder. Therefore, the by-pass with its controlling mechanismfunctions as means to control the amount of fuel fed to the enginecylinders.

As pump assemblies I! are of relatively small size, and it is necessaryto seal against relatively high pressures at points spaced along thecylinder wall, proper sealing thereof has become a serious problem.Because of the small sizes of the elements, the very small clearances,and the construction of the assemblies, it is impossible to use separategaskets, or any like means, without machine work that is prohibitive incost. Furthermore, where actual removable gaskets are used in connectionwith machined grooves, the position of the pump cylinder in the housingbore is predetermined and fixed. Under such conditions, the problem ofequalizing the volume output of the several units is serious becausethere is no way of adjusting the position of the pump cylinders in theirhousing bores without disturbing the seals or requiring new gaskets ordifferent methods of grooving. 7

This problem of sealing is solved by the present invention whereinrelatively thin layers of metal are electroplated, or otherwiseintegrally secured upon the outer surface of each assembly I! as at 33,the several gaskets thus formed being preferably separated by grooves 31formed in the outer pump cylinder wall to provide a series of pressurestages and increase the eiiiciency of-the seals. While the pressures inthe cylinder and. in passage 33 run from 1,000 to 15,000 lbs..per

square inch depending on throttle setting engine 1 and injector nozzlesetup, the seal above identified.

thus

provided serves to prevent leakage through the housing bore either in anupward direction to the atmosphereror downwardly to the fuel inlet,which is at a considerably lower pressure. Escape of fuel downwardlyfrom the fuelinlet 32 is prevented by the provision of an additionalelectroplated gasket. 38.

While gaskets 35 and 38 have been described as plated on thespurnpcylinder, it is to be understood that they maybe alsoplated on theinterior of' the housing borela receiving the pump cylinder. Ineithercase, satisfactory scaling is assured. Furthermore, because of thevery thin and integral= gaskets that are thus provided, assembly anddisassembly of the pump units in the housingisfacilitated. 1

The gaskets 36 formed by electroplating may be of a single metal, or of,a suitablealloy. Copper is preferably employed on engines with high sothat the cylinders orpumpingassemblies may be moved lengthwise in.thebores withoutiiessening the efllciency of the sealingmeans:Longitudinal adjustment of the pump assemblies-mant e quickly andaccurately made byuse'of shims-as shown in Figs. 10 and 11.- Fig.1-0illustrates a shim II! of i generally U-shape which may be fittedbetween the top surface of=housing lT-and the bottom surfaceof: thecircularretainer. flange I08 of each pump assembly. =Because ofitsshape, shim I01 may be inserted or removedfromi between the plunger bodyretainer flange andthe -pump head assembly without removingmthe plungerbody from the pump heada..i.A --shim-of this type may be readily usedwith pumpsgsuch as shown in Fig. 12 of the copending application ShimI09 of Fig.- 11 is of the type preferably used to effect longitudinaladjustment of wing type flanged plunger bodies of the type shownainFigs. 15 and 32 of the copending, application above identified, and arealso designed so that they may be removed or replaced without. removingthe plunger body from the pumphousing;

While itmight be supposed that any shims em ployed between the retainerflanges and-the housing should be circular so that they can function assealing means, and that it would be im-' practical to use a u-shapedshimwhichdeaves one side of thecontact-area open, the-novel sealing meansprovided herein enablesa'U-shaped shim to. be satisfactorily used,sincethe necessary sealing is adequately cared-forty theielec troplatedgaskets, and the shim, or shims, are not required to perform. anysealing function. As shims of the type shownE-in Figs: 10 and ll '65vary in thickness from 0.001: to. 0.0155, any:fde-

sired adjustment of the .plunger =bodyaorrpump assemblycanbemade Bymovingthe: pump assemblies-lengthwise in the pumphead bores; changes in:the 'closin'g time of the plunger body or cylinder, inlet ponttby thepump piston can. be eifectedi This providesia simple, inexpensive, andeffective a means. for equalizing the-volume output ofeachrpum-pingunit. I

To control the east and line or opening of:

' passages 33, and'consequentlythfuel-"delivered to the en ine cylindersper cycler a by-pa'ss ti assembly is provided including a val -@9 ure8), which includes-an upper flang 4 having apertured ears tobeifastened' t'o the housing by a valve cover 43 (Figure 1 and suitablefastening means such as bolts.

The body of valve cage 46 is formedwitha bore 45 which functions asa'valve'seat; the iriain botiy of-the cage being formedwithla shortcylindrical *outer wall 46 and a 'wall- 41" of frustomonicalshape. Wall41 leads to ashoulder andto'a cylindrical walled section 49. The sectionof the cage bounded by wall'fl'is provided" with passages 51 positionedto be in alignmentwith passages 33 when the pump is properly assembled."

The wall of section 49 s preferably cause it is contacted by'the'skirtor solidlpc'rt on 01 the rotary valve which is substantiallyresilient and not compressible. Because of the thin wall construction,any undue bin'ding'h'etween the valve cage and the valve at this pointwhich will cause excessive friction will, in turn,

'cause this part of the valve cage'to heat and quickly expand, therebypreventing failure of the valve at this point.

It will be noted that passages of valve cage 48 are reduced in areaatthe'ir innerends tofd'rm metered holes at the points'they open into ofthe valve cage. This reduces the effective 1;

pressure exerted by the fuel'injection pumpon its delivering strokeagainst'the-sealing portion of the rotary: valve, thereby greatlyreducing the force necessary to maintain a satisfactory'seal at thosepoints. To insure against the leakage or fuel'around' the valve. cage, agasket 52 (Fig' .}8) is provided, Gasket 52 has an inner surface 53-sha'ped togenerally conform to the'frusto-conic'al-surface 41 ofcage-39, and an 'ou'ter surfaceikshapedjto generally lit the walls ofrecess ZI :(Fig. 1)} "Gasket 52 is formed with passages 55 positioned-toconnect passages 5| of cage3 9 and-passages of housing I1. Gasket 52 ispreferably '01 relatively soft metal, so that-when cage 39-is securedshoulder 59.. A rotary valve GL'DIEt QQQPIY ma' chined or constructedfrom a solid piece of metal, preferably resilient in character, isgenerally tubular in shape with an inner flange ilde'gflning twoshoulders 63 and 64, Valve St has metering and non-metering sectionscorresponding'f jrespec tively to sections 58 and 51 'of the shaft} itsmetering section is or a. size to'be fitted oversction 58 of shaft l3,the lower skirt or non-metering surface of the valve beneath shoulder:'8! fitting over section 51 of shaft [3 and shoulder engaging shoulder59; A key on shaft I3 is positioned to engagea key-slot (Figs. 5am: 5a)in valve 6|, so that the valve will-rotate with'the shaft.

A sleeve-like member 68 is provided to fit'cver section 58 of shaft [3within valve Stand-above flange 52 to cooperate with arm; 69 toholdvalve 5| in position. Member 68 is slightly longer than-75' tated';byshaft- 113. By' reason,

Po it n n id of" 111g 7 instance, when the 'valv et-than bi valve inabove flange 'si; fsdftiit when the'assemblyis complete and mi '619"isscrewed onto'the threadedend of shaft ll'i mamher 68 will be securedbetween nut BSa'nd sh ulder 53; but nut. as Will"b e above theupp if iidor thevalve, soth'at'the valve'isnot compressed thereby; Preferablythere is a substantial clearance between the inside bore. off'v 've BIand 1. ei efc geand thef ap: the housing, lug "l3 'operaites to" a ingand closing of passages 33' shaft "[3 in a vertical direction imovementof valve 15 accor' 's 'efq' 'tion ofthe'valve ss inbly;dimculties in" the fop'erati seize and bind the valve, andwhenit'fexpands, it i xfl a is n s ab le k e, Tamm ns te forQthisvariation infthe rati ofexpansion and c'ontractionbetween the rotary'valv e and the valg're cage" the metering orjiiuid control 7 section ortherotary valv'e is oversize at ,i i siis'h y th at r 5 tio'ri iof :thetubular valve" seat Prawai1 hu Li i-t e a r ng m ,nf .i diameter "of"theirotai'y valve betw eniiug 14 13; isfgreater thanvt d ameteriof bore'4 thevalvecagei'j an xainple, theiibqr v of the 'valvefcage is Ainfiifinieter (0.51507) he diameter or the valve "ar'os i preferably be1 about 0.7515 one and one-half heme at metrically to seniljl-eFtiifltwnits, causing the lugs 13 and 14 tobe resiliently held against the innersurfaceof the borecf the valve -i a The pressure'or resilientjcharacterof 'the'yalve can be varied by changingthe' dimensionsfofj, or entirelyeliminating'slots' n andj'l z, for tiieipcr tions of the valve that wdjbe removedfto forin the slots may be left" lacebutreducedlfinthicknessto provide'the e'cessary degree of re- The portion of th'evalvebeneathffshoulder H and referred. toas the, 'skirt'iis pfeferablyofradii amete'rto provide a running lit with bore 4 5, the

fit being close enough toprevent fuel leakage'be; tween the skirt andthe valve cage into the lower part of the" pump housing.

change in the fueltemperaturefshomd cause the valve cage to expandabnormally, the sprlngflike or resilient character of the; valve willcause it to follow up and maintairr'asatisfactoryseah' Like wise, if afuel temperatureichange should cause the valve cage to contract, thediame'ter'fo'f the valve across lugs 14 and I; will be reduced 2. likeof eu-adiiistingitype; v p

As above statedthe lower portion of valve valve by reason of thehighpressure of .the fuel to'which the surface of lug 13 is'subjectedwhen closing, passages 33, lug" is provided substantially diametricallyopposite me 13, so .that the pressure effective against lug 13 istransmitted to the opposite side of the valve cage and valve 6| is-prevented from canting or tipping,

Sincelug H crosses passages 33 only at a time when the correspondingfuel pump assembly is inoperative because of the cam on the camplate asregardsjthe control of fuel. r Valve 'co'ver'43is recessed at 16 toprovidea charnber',to;receive the ends of shaft I3 and valve beingat adifferentpoint,,the lug 14 has no effect when the; shaft is movedupwardly to vary the delivery of "fu'eLI To. insure 'properpositioning"of the valve cover and thevalve cage, valve cover l3i' ispreferablyformed with an annular flangev 1] extending into a recess 18in the top of the valve cage. Recesses' I8 and 16 receive the fueljfedfrom passages 33 and discharge it through a passage 13' to a fuelreservoir, preferably the .fuel

supply tankwhich supplies chamber 29. In operation of the fuel pumpherein described,

fuelis fed from a suitable source of supply to chamber 29 from which itpasses to each of the fuel plunger pump assemblies I? through passages3| when the pistons or plungers- 22' in the pumps are in retractedposition. As each piston 22 is-moved, upwardly bythel cam on the camplate (not shown), the aperture 32 of the pump assembly will be closed,and the fuel in the pump placed under pressure. As shaft |3 and valve 3|rotate with the cam plate and lug I3 is approximatch; in the sameangularposition on valve 6| as the cam'on the cam plate, lug 13 willbeeffective to seal the by-pass passages 33.0f each pump assembly whenthe piston of that assembly is being moved upwardlya As long aspa'ssag'e'33 of the assembly'is closed by lug 13 and the mini mumdischarge pressure. is maintained in the pump cylinder, fuel will bedischarged to the corresponding engine cylinder through connection 35..As soonas passage 33 is opened by lug 13 moving thereby, the pressure onthe fuel in the pump cylinder will be released. Flow of fuel to theengine cylinder will cease because of closure of the pressure valve 35,and the remaining fuel i cover, the position of the stop being looked asby a lock nut 83. A cover 84 is preferably spot welded, or. otherwisesecured to the. .top of -the valve cover to prevent unauthorizedtampering with the valve stop. v if, a

Figure 2 illustrates the present invention as embodied in a manuallyoperated governor.

Where elements are shown corresponding to similar elements in Figure 1,like reference numeralshave been employed.

In Figure 2, a shaft 35- 01 considerably greaten lint fl supports,abearing tvasher 88 011 itsupper .,;race; A bearing 83 is, providedbetween vvasher @381 and 1a second-bearing =washei 9|; secured in g'position'bwa second nut 92 preferably lockedby Ia cotter pini32af, Bearing89 is .securedtofa yoke members}! havingtrunnions Bland a rearlguidinging which slides in a slot in a guideflfi. Lug 95 with guide 36 preventsrotation; of yoke 33, ,wherishaftti rotates.

Turi ions glare engaged'by afork- .91; mounted on a l ,s haft. 98 whichismountedqto vrotate-inz-a. valve cover 3,3 and connected, in turn,. tosuitable [operating means. Thus. when shaft 98 -is,;-rov tate'd, }yol;e93. is moved either; up :or down ;,to effect vertical movement of vshaft 85 and; vary the amountof fuel being fed texti e-en ne cylinders.v alve'cagefli is p'referably r secured Jim-place by .valvecover 'SQhaving suitable fastening means lill, anda fiange |0-2 ofa size-to fitrecess 18 and insure properassemblyof the parts. Valvecover 39 is..apertured at I03 to receive the fuel from theby pass valve and-is formedwith,a,passage ||ll to return the fuelto the fuel supply.-

Fuel is preferably introduced into chamber 2 .'in the main housingthrough a passage J05 leading tothe outside of the housin at a pointbetween adjacentpump assemblies.v The path .of the fuel through the pumpis indicatedgenerally bythe-farrows shown.

lengththan shaft I3 is provided to support valve,

3|. A sleeve 36 correspondingto sleeve 68 of" Flgure3 is provided to besecured by a'nut 8'! screwed on the end of shaft'35, sleeve 86 being ofconsiderably greater length than sleeve 63.

, Valve assembly orconnection 35in: its prelferred lforrn as shown, inFigures 12 -and ,13, -in-- eludes a valve housing having a valve seat II2 'therein, a., Valve l3,.-a valve spring H4, and a combined valvespring support andconnector H5. 'Gaskets H6, preferably of an alloy, areprovided to insure against leakage,. Valve 3 is preferably formed with asealing surface :|.|1 and a seriesiof radiatingwings ||8 whichi contactthe sides of the passage within the husing andinsure proper alignment ofthe, valve at." all times with substantially no interference ,With theflow of ,fuel through the valve assembly, ThisS-con- :structionprovidesa unitary assembly-that can be assembledat the factory and easilyreplaced in the-field. Likewise, the simplicityof the valve enablesitlto be readily dismantled: and. se viced inthefield. H 1 'Ifheassembly of this'invention is particularly advantageous in that it isinterchangeable with .difl'erent types offuel inJection pumps-such, forinstance, as those of the manual controlxtype, or the governor controltype. n

, It is to be understood-.that-the inventionmay be embodied in specificforms-other" than 'that'il lustrated without departing from theprinciple'or essentia1-characteristics thereof. Theembodirirents-;shcivvnare therefore to be consideredias illustrative"andnot fres'trict'ive, the scope of the ve t on b n defined by theappendedclaiins ratherjthan the foregoingidescrip n' nd .d aw{ in'gs'i"All'xfriodifications and changes which come withingthe meanings range ofeduivalencypf the cla iins are therefore intended to be includedtherein, 1 I lcl ai m:, -.1 F 1. .Avalve for usewitha'fuel, pumping anddistributing unit comprising a valve cage having a valve seat thereinand a series} of passages lead,- ing from said valve seat, an expansibleresilient rotary valve in said seat having a section of; less .diameter.than saidseat, a lug on saidvalve section to engage the openings of saidpassages and control fluid flow therethrough, and a second lug first lugto maintain said first lug in sealing relation with said passages.

2. A valve for use with a fuel pumping and distributing unit comprisinga valve cage having a valve seat therein, a rotary valve in said cagehaving one section of a diameter slightly less than the diameter of saidvalve seat and a second section of a diameter normally greater than thediameter of said valve seat, said valve having portions of reducedstrength in said'second section to permit said valve to be compresseddia-.

metrically to permit assembly in said valve seat. said second sectionbeing arranged to function as the fluid control sealing portion of saidvalve.

3. A valve for use with a fuel pumping and distributing unit comprisinga valve cage having a valve seat therein with a relatively thick-walledsection and a relatively thin-walled section, a rotary valve in saidcage having a valve supporting section of a diameter slightly less thanthe diameter of said valve seat and a fluid control sealing section of adiameter normally greater than the diameter of said valve seat, saidvalve .having portions of reduced strength in said latter section topermit said valve to be compressed diametrically to permit assembly insaid valve seat, said first valve section being arranged to rotateadjacent the thin-walled section of said cage.

4. A valve for use with a fuel pumping and distributing unit comprising;a valve cage having a valve seat with fluid openings therein to becontrolled; and a rotary valve in said seat having a fluid controlsealing section opposite said openings and of normally greater diameterthan the adjacent portion of said valve seat, and a non-fluid controlsection at one end of saidfluid control sealing section and ofsubstantially rigid and nonresilient character and of a size to fitsnugly in said valve seat.

5. The valve of claim 4 wherein said fluid con trol sealing sectionincluding: disposed in the plane of said openings to open and close saidopenings on rotation of said valve; and a second lug diametricallyopposite said metering lug to engage the adjacent portion of said valveseat and maintain the metering lug in sealing relation with theopenings.

6. The valve of claim 4 wherein said fluid control sealing section isslotted, said slots terminating adjacent the boundary between saidrigid, non-resilient section and said fluid sealing section.

I. A valve for use with a fuel pumping and distributing unit comprising:a valve cage having a cylindrical bore, the wall of which forms a valveseat; and a valve, rotatable within said seat, having rigidly joinedmetering and nonmetering sections; the metering section being inherentlyresilient and of greater diameter, when removed from the seat, than thediameter of the seat, and being radially compressible to an extentsufficient to permit its insertion into the valve seat and to enable itwhen inserted to conform itself instantaneously to the expansions andcontractions of the valve seat during operation; the nonmetering sectionbeing substantially rigid and dimensioned to fit snugly within the seat,said nonmetering section functioning ,as a valve sealing and guidingmember.

8. A valve for use with a fuel pumping and dis: tributing unitcomprising: a valve cage having an open ended tubular bore, the wall ofwhich forms a tubular seat; a valve actuating shaft in said a meteringlugbore spaced from said seat; an open ended tubular valve havingrigidly joined metering and nonmetering sections extending around saidshaft .within said bore, themetering section being spaced from theshaft,.radially compressible and of a size slightly larger than the boreof the cage so that it normally is compressed by the seat; and means forsecuring the non-metering section of the valve to the shaft, thesecuring means being constructed and arranged to clear the meteringsection sufiiciently to avoid interference with its normalflradialexpansion and contraction during operation.

9. The valve of claim 8 wherein the securing means comprises: atransverse internal flange on the non-metering section of the valve; atransverse shoulder on the shaft positioned to abut one side of thevalve flange; and means adjustably connected to the shaft and arrangedto engage the other side of the valve flange to clamp it against theshaft shoulder.

10. A valve for use with a fuel pumping and distributing unitcomprising: a valve cage having an open ended tubular bore, the wall ofwhich forms a tubular seat; a valve actuating shaft in said bore spacedfrom said seat, said shaft having free and driv .end portions projectingrespectively from opposite ends of said bore; an,

open ended tubular valve having rigidly joined metering and non-meteringsections extending around said shaft within said bore, the meteringsection being. spaced from the shaft, radially compressible and of asize slightly larger than the bore ofthe cage so that it normally iscompressed by the seat; an internal annular flange on the nonmeteringsection of said valve; an annular shoulder on the shaft abutting thedrive side of the flange; a sleeve extending over the shaft within themeterin section of the valve, the sleeve being of a size sufficientlysmaller than the metering section to avoid interference with the normalexpansion and contraction of that section during operation; andadjustable means on the projecting free end. of the shaft. engaging thesleeve to clamp the valve.flange between the sleeve and the shaftshoulder.

11. The valve of claim 10 wherein: the valve and the sleeve areinsertable into and removable from their respective operating positionsthrough that encl of the assembled valve which corresponds to the freeend of the shaft.

12. A valve for usewith a fuel pumping and distributing unit comprising:a valve cage having a cylindrical bore, the wall of which forms asealing seat; and a unitary valve, rotatable in said seat, having afluid sealing and metering section of greater normal diameter than saidseat and a fluid sealing and non-metering section of substantially thesame diameter as said seat, said metering section being formed withpre-determined portions of reduced strength to enable said valve to becompressed diametrically for assemblyin said valve seat.

13. A-valve for use with a fuel pumping and distributing unitcomprising: a valve cage having a cylindrical bore, the wall of whichforms a valve seat; and a unitary valve, rotatable in said seat, havinga fluid sealing and metering section of greater diameter than said seatand a fluid sealing and non-metering section of substantially the samediameter as said seat, said valve being slotted along the meteringsection only to enable such sectionto becompressed diametrically wheninserting the-valve within said seat. v

.' I BYRON. R. POOL.

